Additional voluntary contributions (AVCs)
You can pay additional voluntary contributions which may help to increase your benefits when you retire. The contributions you pay are tax-free. You choose how much you want to pay and your personnel office collect contributions through your payroll before you are taxed. This way you get the tax relief immediately.
Your total pension contributions (to the scheme and AVCs) must not add up to more than 100% of your gross pay (before tax) in any tax year, subject to an annual limit of £50,000 (2011/2012).
To start paying or change your additional voluntary contributions download an AVC Extra application to join (PM176) form.